Mars will never be as big as the full Moon. But this is not the biggest planet. From the point of view of man, the Sun and the Moon will always dominate in the terrestrial heavens. But we know that Jupiter, Saturn – all these planet giants – will never be as big in the sky as the Sun or the Moon. Why?
Before the Sun and the Moon, everything disappears, speaking of brightness, and they seem more in terms of angular size: about 30 arc minutes (30 '), or half a degree.
Which planets in the night sky are the most
All planets in our solar system are larger and larger than the Moon, but are much farther from the Earth than it.
The closer the planet to the Earth, the more they seem
But their angular dimensions change, as the planets rotate relative to each other.
Mercury, the smallest planet, changes from 4.5 '' about 13 “, where 1” (angular second) is 1/3600 degrees.
Neptune (from 2.2 '' to 2.4 '') and Uranus (from 3.3 '' to 4.1 '') will seem even smaller.
Their considerable remoteness from the Earth will ensure this.
Mars experiences the largest relative variations in angular size, from 3.5 “to 25.1”.
Saturn, the second the size of the planet varies from 14.5 “to 20.1”, but if you include its main rings, the size of the variations will be huge – from 33.8 “to 46.9”.
Jupiter, the largest from the planets, is quite far from the Earth.
Its angular size varies From 1965 to 901 Venus, our sister planet, comes close to the Earth, ranging from 9.7 “to an impressive 66.”
People with excellent eyesight, when Venus comes closest, can see its crescent phase even without a telescope.